package com.itheima.reggie.filter;

/**
 * @author 深蓝色的橘子
 * @create 2023-04-23 11:29
 */

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检测用户是否已经完成登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")//拦截所有请求、/*
@Slf4j
public class LoginCheckFilter implements Filter {
    //进行路径比较的类  路径匹配器 支持通配符的写法  /backend/**  =>>  /backend/index.html
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到的请求：{}", requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",//通配符 包含全部
                "/front/**",
                "/common/**" ,//不登陆也可以正常访问这里面的方法了
                "/user/sendMsg",
                "/user/login"
        };


        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);


        //3、如果不需要处理，则直接放行
        log.info("本次请求不需要处理: {}",requestURI);

        if (check) {
            filterChain.doFilter(request, response);//放行语句
            return;
        }
        //4-1、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户ID为: {}",request.getSession().getAttribute("employee"));


            //获取session、 中的id
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);//赋值操作



            //获取线程id
            Long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);


            filterChain.doFilter(request, response);//放行语句
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户ID为: {}",request.getSession().getAttribute("user"));
            //获取session、 中的id
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);//赋值操作
            //获取线程id
            Long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);
            filterChain.doFilter(request, response);//放行语句
            return;
        }
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登陆！");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 第二步 ，路径匹配，检查本次请求是否被放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match)
                return true;
        }
        return false;
    }
}
